--- stack/stack.h	2002/03/07 01:21:07	1.3
+++ stack/stack.h	2002/03/07 03:28:29	1.4
@@ -1,3 +1,24 @@
+/*
+    stack - an interactive interpreter for a stack-based language
+    Copyright (C) 2002  Mats Alritzson and Teddy Hogeborn
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Authors: Mats Alritzson <masse@fukt.bth.se>
+	     Teddy Hogeborn <teddy@fukt.bth.se>
+*/
 
 #define HASHTBLSIZE 2048
 
@@ -54,7 +75,7 @@
   int err;			/* Error flag */
   char *in_string;		/* Input pending to be read */
   char *free_string;		/* Free this string when all input is
-                                   read from in_string */
+				   read from in_string */
   FILE *inputstream;		/* stdin or a file, most likely */
   int interactive;		/* print prompts, stack, etc */
 } environment;
@@ -117,3 +138,5 @@
 extern void foreach(environment*);
 void protect(environment*, value*);
 void unprotect(environment*);
+extern void copying(environment *env);
+extern void warranty(environment *env);